linux-kernel - [PATCH 3.12 16/56] USB: devio: fix issue with log flooding

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Message-Id: <fd44aa85fdbd21b34311ca3d0a7ac5844f4ee1d4.1409735865.git.jslaby@suse.cz>
Date:	Wed,  3 Sep 2014 11:26:35 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.de>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 16/56] USB: devio: fix issue with log flooding

From: Oliver Neukum <oneukum@...e.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit d310d05f1225d1f6f2bf505255fdf593bfbb3051 upstream.

usbfs allows user space to pass down an URB which sets URB_SHORT_NOT_OK
for output URBs. That causes usbcore to log messages without limit
for a nonsensical disallowed combination. The fix is to silently drop
the attribute in usbfs.
The problem is reported to exist since 3.14
https://www.virtualbox.org/ticket/13085

Signed-off-by: Oliver Neukum <oneukum@...e.de>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/core/devio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 71dc5d768fa5..31ffd8459456 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1413,7 +1413,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
 	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
 		u |= URB_ISO_ASAP;
-	if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
+	if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
 		u |= URB_SHORT_NOT_OK;
 	if (uurb->flags & USBDEVFS_URB_NO_FSBR)
 		u |= URB_NO_FSBR;
-- 
2.1.0

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